Update ObjectToString to Harmony-draft algorithm

test/mjsunit/es6/promises.js

 // Copyright 2013 the V8 project authors. All rights reserved.
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 //
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 //       notice, this list of conditions and the following disclaimer.
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// Flags: --allow-natives-syntax
+// Flags: --allow-natives-syntax --harmony-tostring
 
 // Make sure we don't rely on functions patchable by monkeys.
 var call = Function.prototype.call.call.bind(Function.prototype.call)
 var observe = Object.observe;
-var getOwnPropertyNames = Object.getOwnPropertyNames
-var defineProperty = Object.defineProperty
+var getOwnPropertyNames = Object.getOwnPropertyNames;
+var defineProperty = Object.defineProperty;
+
+
+(function() {
+  // Test before clearing global (fails otherwise)
+  assertEquals("[object Promise]",
+      Object.prototype.toString.call(new Promise(function() {})));
+})();
+
 
 function clear(o) {
   if (o === null || (typeof o !== 'object' && typeof o !== 'function')) return
   clear(o.__proto__)
   var properties = getOwnPropertyNames(o)
   for (var i in properties) {
     clearProp(o, properties[i])
   }
 }
 
@@ skipping 807 matching lines @@
   Promise.all([11, Promise.accept(12), 13, MyPromise.accept(14), 15, 16])
   assertTrue(log === "nx14n", "subclass/all/arg")
 
   log = ""
   MyPromise.all([21, Promise.accept(22), 23, MyPromise.accept(24), 25, 26])
   assertTrue(log === "nx24nnx21nnx23nnnx25nnx26n", "subclass/all/self")
 })();
 
 
 assertAsyncDone()